I sent a couple of prototypes to my friend who lives in Canada for testing, she thinks it a great tool for people are in early onset ALS with mild symptoms. I've been trying this device myself a several weeks too, it does require to re-learn the way how the buttons are pressed, but works fairly well once you're used to it. I gave one to my daughter too, she does a loft of editing in Photoshop and found it is convenient for her to do the tracing which take millions of clicks. Sure it does not replace the conventional mouse, but has its advantage in many situations. Have fun.